A helicopter carrying Nepal's tourism minister has crashed in Nepal's hilly east, officials said Wednesday, with no word yet on the fate of those aboard.

An Ethiopian military helicopter crashed inside a United Nations compound in the disputed Abyei region between Sudan and South Sudan, killing three crew members and injuring 10 passengers, the UN said in a statement Sunday.

At least seven local government officials were killed in a helicopter crash in Sudan's eastern al-Qadarif state on Sunday, state news agency SUNA reported.

Rescuers travelled on foot to reach the chopper's wreckage spotted on a forested hillside in neighbouring Nuwakot district.

An American trainer working with Saudi Arabia' National Guard was killed on Thursday in a helicopter crash in Riyadh in the course of a routine activity, a statement published by state media said.

A helicopter crash in northern Afghanistan on Sunday killed at least three people including a foreign pilot, Afghan officials said.

Australian Associated Press reported that the aircraft, a 1994 Kawasaki BK117, had crashed into a tree.

Eighteen people were killed in a helicopter crash in the Krasnoyarsk region in Siberia on Saturday, the aviation watchdog and emergency services said.

At least three people were killed in a helicopter crash in northeastern Thailand on Wednesday, officials said.

A Russian helicopter crashed in Syria late on Monday killing both pilots, Moscow's defence ministry said in a statement carried by news agencies.

A Russian military helicopter has crashed during a training night flight over the Baltic Sea, killing two pilots, the Russian army said on Friday.

At least 13 people on the ground, including three children, were killed when a Mexican military helicopter carrying top officials surveying damages from an earthquake crashed in a small town in the southern state of Oaxaca, authorities said on Saturday.